JP2011512667A - Printed circuit board - Google Patents

Abstract

A printed circuit board is disclosed in which the width of the signal transmission line can be increased without impedance mismatching, and a part of the contact portion is exposed. A printed circuit board capable of expanding the width of a signal transmission line without impedance mismatching according to an embodiment of the present invention includes a first ground layer, a first dielectric layer, which are sequentially stacked and extended in the same direction, and A signal transmission line and a plurality of first ground patterns are provided. The first ground pattern is formed by etching the surface of the first ground layer in a line at a predetermined interval in the major axis direction of the surface of the first ground layer. The plurality of first ground patterns expose the first dielectric layer. The printed circuit board exposing a part of the contact portion includes a signal transmission line, a contact portion, and a cover layer. The contact portion is formed integrally with the signal transmission line, and has a width wider than the width of the signal transmission line at the tip of the signal transmission line. The cover layer covers the entire surface on which the signal transmission line is formed. The cover layer includes a hole that exposes the contact portion excluding a part of the contact portion close to the signal transmission line.
[Selection] Figure 3

Description

  The present invention relates to a printed circuit board, and in particular, the width of a signal transmission line can be increased without impedance mismatching, and a printed circuit board can be formed by exposing a part of a contact portion and not exposing the remaining part. The present invention relates to a printed circuit board that prevents a signal transmission line from being cut even if the wire is broken.

  An internal circuit of a wireless communication device is generally implemented by a printed circuit board (PCB). The technology of such a printed circuit board is rapidly developing, and at present, not only the conventional hard printed circuit board but also a flexible circuit board (flexible PCB: FPCB) capable of moving freely. Widely used.

  The technical problem to be solved by the present invention is to provide a printed circuit board capable of expanding the width of a signal transmission line without impedance mismatching.

  Another technical problem to be solved by the present invention is to provide a printed circuit board in which a part of the contact portion is exposed and the remaining part is not exposed.

  A printed circuit board according to an embodiment of the present invention for achieving the above technical problem includes a plurality of first ground layers, first dielectric layers, and signal transmission lines that are sequentially stacked and extended in the same direction. A first ground pattern. The first ground pattern is formed by etching the surface of the first ground layer in a line at a predetermined interval in the major axis direction of the surface of the first ground layer. The plurality of first ground patterns expose the first dielectric layer.

  The printed circuit board includes a bonding sheet disposed on the signal transmission line, a second dielectric layer disposed on the bonding sheet, and a second ground layer disposed on the second dielectric layer. A plurality of second ground patterns formed by etching the surface of the second ground layer in a line at a predetermined interval in the major axis direction of the surface of the second ground layer. The plurality of second ground patterns expose the second dielectric layer.

  The first and second ground patterns are formed along the center in the major axis direction of the surfaces of the first ground layer and the second ground layer.

  A printed circuit board according to another embodiment of the present invention for solving the technical problem includes a first ground layer extended in one direction, a first ground layer stacked on the first ground layer, A first dielectric layer extended in the same direction, a signal transmission line stacked on the first dielectric layer and extended in the same direction as the first dielectric layer, and the first ground layer A first ground pattern formed by etching the surface of the first ground layer with a predetermined width in the major axis direction of the surface, and a length of the surface of the first ground layer on both sides of the first ground pattern. A plurality of second ground patterns formed by etching the surface of the first ground layer in a line at predetermined intervals in the axial direction. In each of the second ground patterns, the width of the portion far from the first ground pattern is wider than the width of the portion near the first ground pattern, and the first and second ground patterns are the first dielectric layer. To expose.

  The printed circuit board includes a bonding sheet disposed on the signal transmission line, a second dielectric layer disposed on the bonding sheet, and a second ground layer disposed on the second dielectric layer. A third ground pattern formed by etching the surface of the second ground layer with a predetermined width in a major axis direction of the surface of the second ground layer; and on both sides of the third ground pattern, A plurality of fourth ground patterns formed by etching the surface of the second ground layer in a line at a predetermined interval in the major axis direction of the surface of the two ground layers, The third ground pattern and the fourth ground pattern expose the second dielectric layer.

  The first and third ground patterns are formed in a line at a predetermined interval along the center in the major axis direction of the first and third ground patterns, and the first and third ground patterns are not etched. At least one bridge electrically connecting unetched portions on both sides of the third ground pattern is provided.

  A printed circuit board according to another embodiment of the present invention for solving the technical problem includes a first ground layer extending in one direction, a first ground layer stacked on the first ground layer, and the first ground layer. A first dielectric layer extended in the major axis direction, a signal transmission line stacked on the first dielectric layer and extended in the major axis direction of the first dielectric layer, and the first ground layer A plurality of first ground patterns formed by etching the surface of the first ground layer in a line at a predetermined interval in the major axis direction of the surface of the surface, on both sides of the first ground pattern, A plurality of second ground patterns formed by etching the surface of the first ground layer in a row at a predetermined interval, and the first ground The farther from the center of the surface of the ear, the width of each of the second ground patterns measured in the major axis direction of the first ground layer becomes gradually wider, and the first and second ground patterns are Expose the dielectric layer.

  The printed circuit board includes a bonding sheet disposed on the signal transmission line, a second dielectric layer disposed on the bonding sheet, and a second ground layer disposed on the second dielectric layer. A plurality of third ground patterns formed by etching the surface of the second ground layer in a line at predetermined intervals in the major axis direction of the surface of the second ground layer; and A plurality of fourth ground patterns formed by etching the surface of the second ground layer in a row at predetermined intervals on both sides of the ground pattern in the major axis direction of the surface of the second ground layer. And further, it is measured in the longitudinal direction of the second ground layer as it is farther from the center of the second ground layer. Width of the fourth ground pattern Les progressively widened, the third and fourth ground patterns expose the second dielectric layer.

  The first and third ground patterns are formed along the center in the major axis direction of the surfaces of the first and second ground layers.

  A printed circuit board according to still another embodiment of the present invention for solving the technical problem may include a first ground layer that extends in one direction, a first ground layer stacked on the first ground layer, and the first ground layer. A first dielectric layer extended in the major axis direction, a signal transmission line stacked on the first dielectric layer and extended in the major axis direction of the first dielectric layer, and the first ground layer A plurality of first ground patterns formed by etching the surface of the first ground layer in a line at a predetermined interval in the major axis direction of the surface of the surface, on both sides of the first ground pattern, A plurality of second ground patterns formed by etching the surface of the first ground layer in a line at a predetermined interval, the first ground The farther from the center of the layer, the widths of the respective second ground patterns measured in the major axis direction of the first ground layer become constant while gradually increasing, and the first and second ground patterns are The first dielectric layer is exposed.

  The printed circuit board includes a bonding sheet disposed on the signal transmission line, a second dielectric layer disposed on the bonding sheet, and a second ground layer disposed on the second dielectric layer. A plurality of third ground patterns formed by etching the surface of the second ground layer in a line at predetermined intervals in the major axis direction of the surface of the second ground layer; and A plurality of fourth ground patterns formed by etching the surface of the second ground layer in a row at predetermined intervals on both sides of the ground pattern; and from the center of the second ground layer As the distance increases, the width of each of the fourth ground patterns measured in the major axis direction of the second ground layer gradually increases. While seeking, it becomes constant, the third and fourth ground patterns expose the second dielectric layer.

  When the major axis direction centers of the surfaces of the first and second ground layers are used as a reference, the points where the widths of the second and fourth ground patterns are constant are outside the edge of the signal transmission line. It is in.

  The printed circuit board is a flexible printed circuit board.

  A printed circuit board according to an embodiment of the present invention for solving the other technical problems includes a signal transmission line, a contact portion, and a cover layer.

  The contact portion is formed integrally with the signal transmission line, and has a width wider than the width of the signal transmission line at the tip of the signal transmission line. The cover layer covers the entire surface on which the signal transmission line is formed. The cover layer includes a hole that exposes a contact portion excluding a partial region of the contact portion close to the signal transmission line.

  The signal transmission line may further include a branch. The branch is connected to the center of the signal transmission line and protrudes from the center of the signal transmission line in a direction different from the direction in which the signal transmission line is extended. The branch protrudes from at least one side of the signal transmission line.

  The branches are projected at an angle perpendicular to or smaller than the direction in which the signal transmission layer is stretched.

  The printed circuit board can be a flexible printed circuit board.

  The printed circuit board according to the embodiment of the present invention has an advantage that the width of the signal transmission line can be widened without impedance mismatching, and the printed circuit board according to the embodiment of the present invention exposes a part of the contact portion. By not exposing the remaining part, the signal transmission line can be prevented from being cut even if the printed circuit board is broken.

It is a figure which shows the 1st example of a printed circuit board. It is a figure which shows the 2nd example of a printed circuit board. It is a figure which shows the ground layer by 1st Embodiment of this invention. It is a figure which shows the ground layer by 2nd Embodiment of this invention. It is a figure which shows the ground layer by 3rd Embodiment of this invention. It is a figure which shows the ground layer by 4th Embodiment of this invention. 1 is a diagram illustrating a printed circuit board according to an embodiment of the present invention. It is a figure which shows the cover layer by embodiment of this invention. FIG. 9 is a diagram illustrating a printed circuit board according to an embodiment of the present invention in which the printed circuit board of FIG. 7 and the cover layer of FIG. 8 are combined. It is a figure which shows the comparative example provided as an objective compared with embodiment of this invention. FIG. 6 is a view illustrating a printed circuit board according to another embodiment of the present invention. FIG. 6 is a view illustrating a printed circuit board according to another embodiment of the present invention.

  For a full understanding of the present invention, its operational advantages, and the objects attained by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings that illustrate preferred embodiments of the invention. I must.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like members.

  The printed circuit board (PCB) disclosed herein may be a general printed circuit board or may be a flexible printed circuit board.

  FIG. 1 is a diagram illustrating a first example of a printed circuit board.

  The printed circuit board 160 shown in FIG. 1 includes a first ground layer 164, a first dielectric layer 166, and a signal transmission line 162. The first ground layer 164, the first dielectric layer 166, and the signal transmission line 162 are sequentially stacked and extended in the same direction.

  The first ground layer 164 is made of a metallic material (for example, copper) and connected to the ground. The first dielectric layer 166 is made of a dielectric material (for example, polyimide). The signal transmission line 162 is made of a metallic material (for example, copper).

  FIG. 2 is a diagram illustrating a second example of the printed circuit board.

  The printed circuit board 180 shown in FIG. 2 includes a first ground layer 184, a first dielectric layer 186, a signal transmission line 182, a bonding sheet 187, a second dielectric layer 188, and a second ground layer 189.

  Compared with the printed circuit board 160 shown in FIG. 1, the printed circuit board 180 shown in FIG. 2 further includes a bonding sheet 187, a second dielectric layer 188, and a second ground layer 189. The second ground layer 189 is made of a metallic material (eg, copper) and is connected to the ground. The second dielectric layer 188 is made of a dielectric material (for example, polyimide). The bonding sheet 187 joins the second dielectric layer 188 and the second ground layer 189 to the signal transmission line 182.

  FIG. 3 is a diagram illustrating a ground layer according to the first embodiment of the present invention.

  Referring to FIG. 3, the ground layer 200 according to the first embodiment of the present invention includes a plurality of ground patterns 210, 212, 214, and 216. The plurality of ground patterns 210, 212, 214, and 216 are formed by etching the surface of the ground layer 200 until the dielectric layer is exposed.

  The plurality of ground patterns 210, 212, 214, and 216 are formed in a line at a predetermined interval along the center in the long axis direction of the surface of the ground layer 200. Since the plurality of ground patterns 210, 212, 214, 216 are formed at predetermined intervals, an unetched bridge configuration 230, between the plurality of ground patterns 210, 212, 214, 216, 232 and 234 appear.

  The plurality of ground patterns 210, 212, 214, and 216 may have a rectangular shape as shown in FIG. 3, or may have other shapes.

  In order to reduce the conductor loss, the width of the signal transmission line must be increased. However, if the width of the signal transmission line is increased, the capacitance between the signal transmission line and the ground layer increases, thereby reducing the impedance. Therefore, when the width of the signal transmission line is increased, impedance mismatching occurs.

  However, in the ground layer 200 according to the first embodiment of the present invention, the ground layer 200 has an effect of narrowing due to the ground patterns 210, 212, 214, and 216. In this case, the capacitance between the signal transmission line and the ground layer 200 is reduced, thereby increasing the impedance. Accordingly, in the printed circuit board including the ground layer 200 according to the first embodiment of the present invention, the width of the signal transmission line can be widened without impedance mismatching.

  FIG. 4 is a diagram illustrating a ground layer according to a second embodiment of the present invention.

  Referring to FIG. 4, the ground layer 300 according to the second embodiment of the present invention includes a first ground pattern 310 and a plurality of second ground patterns 330, 332, 334, 338, 340, 342, 344, 348. . The second ground patterns 330, 332, 334, 338, 340, 342, 344, and 348 are disposed on both sides of the first ground pattern 310 along the major axis direction of the surface of the ground layer 300. The first and second ground patterns 310, 330, 332, 334, 338, 340, 342, 344, and 348 are formed by etching the surface of the ground layer 300 until the dielectric layer is exposed.

  In each of the second ground patterns 330, 332, 334, 338, 342, 344, and 348, the width of the portion far from the first ground pattern 310 is wider than the width of the portion near the first ground pattern 310. For example, as shown in FIG. 4, the second ground patterns 330, 332, 334, 338, 340, 342, 344, 348 may have a triangular shape.

  Even in the printed circuit board including the ground layer 300 according to the second embodiment of the present invention, the width of the signal transmission line can be increased without impedance mismatching, which will be described.

  Referring to FIG. 4, W1 and W2 indicate the width of the signal transmission line. In order to compare the size of the capacitance between the signal transmission line and the ground layer 300 when the width of the signal transmission line is W1 and when the width of the signal transmission line is W2, the region of the ground layer 300 is compared. The width of the overlapping area with the signal transmission line is compared. If the width of the signal transmission line is increased from W1 to W2, the overlapped region is widened by S1 + S2 and narrowed by S3. In this case, if the second ground pattern 332 is formed so that S1 + S2 and S3 are the same, the signal transmission line and the ground layer 300 overlap even if the width of the signal transmission line increases from W1 to W2. The size of the area to be applied is maintained as it is. Accordingly, since the size of the capacitance between the signal transmission line and the ground layer 300 does not change, the width of the signal transmission line can be increased without impedance mismatching.

  FIG. 5 is a diagram illustrating a ground layer according to a third embodiment of the present invention.

  Referring to FIG. 5, the ground layer 400 according to the second embodiment of the present invention includes a plurality of first ground patterns 410, 412, 414 and a plurality of second ground patterns 430, 432, 434, 440, 442, 444. With.

  The plurality of first ground patterns 410, 412, and 414 are arranged in a line at a predetermined interval along the major axis direction of the surface of the ground layer 400. The surface of the ground layer 400 may be arranged along the center in the long axis direction. The second ground patterns 430, 432, 434, 440, 442, 444 are disposed on both sides of the first ground patterns 410, 412, 414 along the major axis direction of the surface of the ground layer 400. The first and second ground patterns 410, 412, 414, 430, 432, 434, 440, 442, and 444 are formed by etching the surface of the ground layer 400 until the dielectric layer is exposed.

  The plurality of first ground patterns 410, 412, and 414 may have a circular shape as shown in FIG. 5, or may have other shapes.

  In each of the second ground patterns 430, 432, 434, 440, 442, 444, the width of the portion far from the center in the long axis direction of the ground layer 400 is larger than the width of the portion near the center in the long axis direction of the ground layer 400. wide. Furthermore, the width of each of the second ground patterns 430, 432, 434, 440, 442, 444 measured in the major axis direction of the ground layer 400 can gradually increase as the distance from the center of the surface of the ground layer 400 increases. For example, as shown in FIG. 4, the second ground patterns 430, 432, 434, 440, 442, 444 may have a triangular shape.

  The second ground patterns 430, 432, 434, 440, 442, and 444 shown in FIG. 5 have the same form as the second ground patterns 330, 332, 334, 340, 342, and 344 shown in FIG. . Therefore, even in the printed circuit board including the ground layer 400 of FIG. 5, even if the width of the signal transmission line changes, the size of the capacitance between the signal transmission line and the ground layer 400 does not change. Therefore, the width of the signal transmission line can be increased without impedance mismatching.

  Meanwhile, the ground layer according to the second embodiment of the present invention shown in FIG. 4 is shown in the ground patterns 210, 212, 214, 216 shown in FIG. In addition, first ground patterns 410, 412, and 414 may be provided.

  FIG. 6 is a diagram illustrating a ground layer according to a fourth embodiment of the present invention.

  The ground layer according to the fourth embodiment of the present invention shown in FIG. 6 will be described only with respect to differences from the ground layer shown in FIG.

  Referring to FIG. 6, in each of the second ground patterns 530, 532, 534, 540, 542, and 544, the distance from the center of the surface of the ground layer 500 increases in the major axis direction of the ground layer 500. The widths of the two ground patterns 530, 532, 534, 540, 542, and 544 become constant while gradually becoming wider. For example, as shown in FIG. 6, the second ground patterns 530, 532, 534, 540, 542, and 544 may have a combination of a triangular shape and a square shape. Even in the ground layer according to the fourth embodiment of the present invention shown in FIG. 6, the width of the signal transmission line can be increased without impedance mismatching.

  Further, when the center of the surface of the ground layer 500 in the major axis direction is used as a reference, the points where the widths of the second ground patterns 530, 532, 534, 540, 542, and 544 are constant are the edges of the signal transmission line. It can be located outside the part.

  The ground layer shown in FIGS. 3 to 6 may be the first ground layer or the second ground layer shown in FIGS. That is, the ground pattern may be formed on the surface of the first ground layers 164 and 184 shown in FIG. 1 or FIG. 2, and may be formed on the upper surface of the second ground layer 189 shown in FIG. There is also. Further, it may be formed only at one of the first ground layer 184 or the second ground layer 189 shown in FIG.

  Next, a printed circuit board that prevents a signal transmission line from being cut even if the printed circuit board is broken by exposing a part of the contact portion and not exposing the remaining part will be described.

  FIG. 7 is a view illustrating a printed circuit board according to an embodiment for solving another technical problem of the present invention.

  Referring to FIG. 7, a printed circuit board 200a according to another embodiment of the present invention includes a signal transmission line 262a and a contact part 267a. The contact portion 267a is connected to the tip of the signal transmission line 262a and is formed integrally with the signal transmission line 262a. The width of the contact portion 267a is wider than the width of the signal transmission line 262a.

  FIG. 8 is a diagram illustrating a cover layer according to an embodiment for solving another technical problem of the present invention.

  FIG. 9 is a view illustrating a printed circuit board according to an embodiment of the present invention in which the printed circuit board of FIG. 7 and the cover layer of FIG. 8 are combined.

  Referring to FIGS. 8 and 9, a cover layer 300a according to another embodiment of the present invention covers the entire surface of the printed circuit board 200a where the signal transmission line 262a is formed. However, the cover layer 300a includes a hole 370a. The hole 370a exposes the remaining area of the contact portion 267a except the partial area close to the signal transmission line 262a. That is, the cover layer 300a does not expose the portion where the signal transmission line 262a and the contact portion 267a are in contact with each other. In this way, by not exposing the portion whose thickness changes suddenly to the outside, the signal transmission line 262a is prevented from being cut when the printed circuit board 200a is broken.

  FIG. 10 is a diagram showing a comparative example provided as an object to be compared with the embodiment of the present invention.

  As shown in FIG. 10, if it is assumed that the portion where the signal transmission line 262a and the contact portion 267a are in contact, that is, the portion where the thickness changes suddenly is exposed to the outside through the hole 370a, the printed circuit board 200a is broken. In some cases, the signal transmission line 262a is easily cut off.

  Referring to FIG. 7 again, the printed circuit board 200a according to the embodiment of the present invention may further include a branch 265a. The branch 265a is connected to the center of the signal transmission line 262a and protrudes from the center of the signal transmission line 262a in a direction different from the direction in which the signal transmission line 262a is extended. The branch 265a may protrude from at least one side of the signal transmission line 262a. For example, FIG. 7 shows a shape in which the branch 265a protrudes perpendicularly to the direction in which the signal transmission line 262a extends on one side of the signal transmission line 262a. Thus, the branch 265a connected to the center of the signal transmission line 262a prevents resonance from occurring.

  FIG. 11 is a view illustrating a printed circuit board according to another embodiment of the present invention.

  Referring to FIG. 11, in a printed circuit board 600a according to another embodiment of the present invention, branches 665a protrude perpendicular to the direction in which the signal transmission line 662a is extended on both sides of the signal transmission line 662a.

  FIG. 12 is a view illustrating a printed circuit board according to another embodiment of the present invention.

  Referring to FIG. 12, in a printed circuit board 700a according to another embodiment of the present invention, a branch 765a protrudes at an angle smaller than perpendicular to the direction in which the signal transmission line 762a is extended on one side of the signal transmission line 762a. Is done.

  As mentioned above, the optimal embodiment was disclosed by drawing and the specification. Although specific terms are used herein, they are merely used for the purpose of describing the present invention and limit the scope of the invention as defined in the meaning and claims. It was not used for that purpose. Accordingly, those skilled in the art will appreciate that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention should be determined by the technical idea of the claims.

  The present invention can be used in the field of manufacturing printed circuit boards.

Claims (16)

A first ground layer stretched in one direction;
A first dielectric layer stacked on the first ground layer and extended in the same direction as the first ground layer;
A signal transmission line stacked on the first dielectric layer and extended in the same direction as the first dielectric layer;
A plurality of first ground patterns formed by etching the surface of the first ground layer in a line at a predetermined interval in the major axis direction of the surface of the first ground layer;
The plurality of first ground patterns may be a printed circuit board exposing the first dielectric layer. The printed circuit board is:
A bonding sheet disposed on the signal transmission line;
A second dielectric layer disposed on the bonding sheet;
A second ground layer disposed on the second dielectric layer;
A plurality of second ground patterns formed by etching the surface of the second ground layer in a line at predetermined intervals in the major axis direction of the surface of the second ground layer;
The printed circuit board of claim 1, wherein the plurality of second ground patterns expose the second dielectric layer. The first and second ground patterns are:
The printed circuit board according to claim 1, wherein the printed circuit board is formed along a center in a major axis direction of surfaces of the first ground layer and the second ground layer. A first ground layer stretched in one direction;
A first dielectric layer stacked on the first ground layer and extended in the same direction as the first ground layer;
A signal transmission line stacked on the first dielectric layer and extended in the same direction as the first dielectric layer;
A first ground pattern formed by etching the surface of the first ground layer with a predetermined width in the major axis direction of the surface of the first ground layer;
A plurality of first ground layers formed by etching the surface of the first ground layer in a row at predetermined intervals on both sides of the first ground pattern in the major axis direction of the surface of the first ground layer. 2 ground patterns,
In each of the second ground patterns, the width of the portion far from the first ground pattern is wider than the width of the portion near the first ground pattern,
The first and second ground patterns are printed circuit boards that expose the first dielectric layer. The printed circuit board is:
A bonding sheet disposed on the signal transmission line;
A second dielectric layer disposed on the bonding sheet;
A second ground layer disposed on the second dielectric layer;
A third ground pattern formed by etching the surface of the second ground layer with a predetermined width in the major axis direction of the surface of the second ground layer;
A plurality of second ground layers formed by etching the surface of the second ground layer in a row at predetermined intervals on both sides of the third ground pattern in the major axis direction of the surface of the second ground layer. 4 ground patterns,
The printed circuit board of claim 4, wherein the third ground pattern and the fourth ground pattern expose the second dielectric layer. The first and third ground patterns are:
The first and third ground patterns are formed in a line at predetermined intervals along the center in the major axis direction, and etched on both sides of the first and third ground patterns in an unetched state. The printed circuit board according to claim 4, further comprising at least one bridge that electrically connects the non-connected portions. A first ground layer stretched in one direction;
A first dielectric layer stacked on the first ground layer and extended in a longitudinal direction of the first ground layer;
A signal transmission line stacked on the first dielectric layer and extended in a longitudinal direction of the first dielectric layer;
A plurality of first ground patterns formed by etching the surface of the first ground layer in a line at a predetermined interval in the major axis direction of the surface of the first ground layer;
A plurality of second ground patterns formed by etching the surface of the first ground layer in a row at predetermined intervals on both sides of the first ground pattern;
The farther from the center of the first ground layer, the width of each second ground pattern measured in the long axis direction of the first ground layer becomes gradually wider.
The first and second ground patterns are printed circuit boards that expose the first dielectric layer. The printed circuit board is:
A bonding sheet disposed on the signal transmission line;
A second dielectric layer disposed on the bonding sheet;
A second ground layer disposed on the second dielectric layer;
A plurality of third ground patterns formed by etching the surface of the second ground layer in a line at predetermined intervals in the major axis direction of the surface of the second ground layer;
A plurality of second ground layers formed by etching the surface of the second ground layer in a row at predetermined intervals on both sides of the third ground pattern in the major axis direction of the surface of the second ground layer. 4 ground patterns,
The farther from the center of the second ground layer, the width of each of the fourth ground patterns measured in the major axis direction of the second ground layer becomes gradually wider.
The printed circuit board of claim 7, wherein the third and fourth ground patterns expose the second dielectric layer. The first and third ground patterns are:
The printed circuit board according to claim 7, wherein the printed circuit board is formed along a center in a major axis direction of surfaces of the first and second ground layers. A first ground layer stretched in one direction;
A first dielectric layer stacked on the first ground layer and extended in a longitudinal direction of the first ground layer;
A signal transmission line stacked on the first dielectric layer and extended in a longitudinal direction of the first dielectric layer;
A plurality of first ground patterns formed by etching the surface of the first ground layer in a line at a predetermined interval in the major axis direction of the surface of the first ground layer;
A plurality of second ground patterns formed by etching the surface of the first ground layer in a row at predetermined intervals on both sides of the first ground pattern;
The further away from the center of the first ground layer, the width of each second ground pattern measured in the long axis direction of the first ground layer becomes constant while gradually increasing,
The first and second ground patterns are printed circuit boards that expose the first dielectric layer. The printed circuit board is:
A bonding sheet disposed on the signal transmission line;
A second dielectric layer disposed on the bonding sheet;
A second ground layer disposed on the second dielectric layer;
A plurality of third ground patterns formed by etching the surface of the second ground layer in a line at predetermined intervals in the major axis direction of the surface of the second ground layer;
A plurality of fourth ground patterns formed by etching the surface of the second ground layer in a line at predetermined intervals on both sides of the third ground pattern;
The farther from the center of the second ground layer, the width of each of the fourth ground patterns measured in the long axis direction of the second ground layer becomes constant while gradually increasing.
The printed circuit board of claim 10, wherein the third and fourth ground patterns expose the second dielectric layer. When using the center of the major axis direction of the surface of the first and second ground layers as a reference,
12. The printed circuit board according to claim 10, wherein a point at which the width of each of the second and fourth ground patterns is constant is outside an edge of the signal transmission line. In a printed circuit board in which a signal transmission line and a contact portion having a width wider than the width of the signal transmission line are integrally formed at the tip of the signal transmission line,
A cover layer covering the entire surface on which the signal transmission line is formed;
The cover layer is
A printed circuit board including a hole exposing the contact portion excluding a partial region of the contact portion close to the signal transmission line. The signal transmission line is
A branch connected to the center of the signal transmission line and protruding from the center of the signal transmission line in a direction different from the direction in which the signal transmission line is extended;
The printed circuit board according to claim 13, wherein the branch protrudes from at least one side of the signal transmission line. The branch is
The printed circuit board according to claim 14, wherein the signal transmission layer protrudes at an angle perpendicular to or smaller than a direction in which the signal transmission layer is stretched. The printed circuit board is:
The printed circuit board according to claim 1, wherein the printed circuit board is a flexible printed circuit board.

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